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Had a little bit of a challenge designing a custom sprocket for a larger than standard chain pitch. I am amazed at how easy it was to do in Onshape. The variable table only has three values that are manipulated and the rest are equations to control the size and the tooth form. Switching between all of the options made this a breeze and was much easier than doing it in other CAD programs. I can honestly say that getting an Onshape license was probably the best thing I could have done for my career, and my appreciation for it grows every day.

I like the idea of it being a feature in the tree like a variable, but for queries. This would make it more explicit that it's being used, which would help team mates (or future me) understand the model. The greatest danger of this kind of ability is updates happening in unforeseen and unintended ways, so the more explicit it can be the better.

can you share your document and link it here? hard to tell how to improve if we cannot review your current loft setup.

Its likely you'r using too many contours in the loft (less control provides better surfaces quality usually).

you probably need to model the surfaces at the nose/tip separately to model a proper transition to the sharp point.